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path: root/src/transport/plugin_transport_http_server.c
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/*
     This file is part of GNUnet
     (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 3, or (at your
     option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file transport/plugin_transport_http.c
 * @brief http transport service plugin
 * @author Matthias Wachs
 */

#include "plugin_transport_http.h"

#define HTTP_ERROR_RESPONSE "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\"><HTML><HEAD><TITLE>404 Not Found</TITLE></HEAD><BODY><H1>Not Found</H1>The requested URL was not found on this server.<P><HR><ADDRESS></ADDRESS></BODY></HTML>"
#define _RECEIVE 0
#define _SEND 1

static void
server_log (void *arg, const char *fmt, va_list ap)
{
  char text[1024];

  vsnprintf (text, sizeof (text), fmt, ap);
  va_end (ap);
  GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "server: %s\n", text);
}

struct ServerConnection
{
  /* _RECV or _SEND */
  int direction;

  /* should this connection get disconnected? GNUNET_YES/NO  */
  int disconnect;

  struct Session *session;
  struct MHD_Connection * mhd_conn;
};

/**
 * Check if incoming connection is accepted.
 * NOTE: Here every connection is accepted
 * @param cls plugin as closure
 * @param addr address of incoming connection
 * @param addr_len address length of incoming connection
 * @return MHD_YES if connection is accepted, MHD_NO if connection is rejected
 *
 */
static int
server_accept_cb (void *cls, const struct sockaddr *addr, socklen_t addr_len)
{
  struct Plugin * plugin = cls;

  if (plugin->cur_connections <= plugin->max_connections)
    return MHD_YES;
  else
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "server: Cannot accept new connections\n");
    return MHD_NO;
  }
}


/**
 * Callback called by MHD when it needs data to send
 * @param cls current session
 * @param pos position in buffer
 * @param buf the buffer to write data to
 * @param max max number of bytes available in buffer
 * @return bytes written to buffer
 */
#if 0
static ssize_t
server_send_cb (void *cls, uint64_t pos, char *buf, size_t max)
{

  return 0;
}
#endif


#if BUILD_HTTPS
static char *
server_load_file (const char *file)
{
  struct GNUNET_DISK_FileHandle *gn_file;
  struct stat fstat;
  char *text = NULL;

  if (0 != STAT (file, &fstat))
    return NULL;
  text = GNUNET_malloc (fstat.st_size + 1);
  gn_file =
      GNUNET_DISK_file_open (file, GNUNET_DISK_OPEN_READ,
                             GNUNET_DISK_PERM_USER_READ);
  if (gn_file == NULL)
  {
    GNUNET_free (text);
    return NULL;
  }
  if (GNUNET_SYSERR == GNUNET_DISK_file_read (gn_file, text, fstat.st_size))
  {
    GNUNET_free (text);
    GNUNET_DISK_file_close (gn_file);
    return NULL;
  }
  text[fstat.st_size] = '\0';
  GNUNET_DISK_file_close (gn_file);
  return text;
}
#endif


#if BUILD_HTTPS

static int
server_load_certificate (struct Plugin *plugin)
{
  int res = GNUNET_OK;

  char *key_file;
  char *cert_file;

  /* Get crypto init string from config
   * If not present just use default values */
  GNUNET_CONFIGURATION_get_value_string (plugin->env->cfg, plugin->name,
                                         "CRYPTO_INIT", &plugin->crypto_init);

  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_filename (plugin->env->cfg, plugin->name,
                                               "KEY_FILE", &key_file))
  {
    key_file = "https_key.key";
  }

  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_filename (plugin->env->cfg, plugin->name,
                                               "CERT_FILE", &cert_file))
  {
    cert_file = "https_cert.crt";
  }

  /* read key & certificates from file */
#if VERBOSE_SERVER
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Loading TLS certificate from key-file `%s' cert-file`%s'\n",
              key_file, cert_file);
#endif

  plugin->key = server_load_file (key_file);
  plugin->cert = server_load_file (cert_file);

  if ((plugin->key == NULL) || (plugin->cert == NULL))
  {
    struct GNUNET_OS_Process *cert_creation;

    GNUNET_free_non_null (plugin->key);
    plugin->key = NULL;
    GNUNET_free_non_null (plugin->cert);
    plugin->cert = NULL;

#if VERBOSE_SERVER
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "No usable TLS certificate found, creating certificate\n");
#endif
    errno = 0;
    cert_creation =
        GNUNET_OS_start_process (NULL, NULL,
                                 "gnunet-transport-certificate-creation",
                                 "gnunet-transport-certificate-creation",
                                 key_file, cert_file, NULL);
    if (cert_creation == NULL)
    {
      GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name,
                       _
                       ("Could not create a new TLS certificate, program `gnunet-transport-certificate-creation' could not be started!\n"));
      GNUNET_free (key_file);
      GNUNET_free (cert_file);

      GNUNET_free_non_null (plugin->key);
      GNUNET_free_non_null (plugin->cert);
      GNUNET_free_non_null (plugin->crypto_init);

      return GNUNET_SYSERR;
    }
    GNUNET_assert (GNUNET_OK == GNUNET_OS_process_wait (cert_creation));
    GNUNET_OS_process_close (cert_creation);

    plugin->key = server_load_file (key_file);
    plugin->cert = server_load_file (cert_file);
  }

  if ((plugin->key == NULL) || (plugin->cert == NULL))
  {
    GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name,
                     _
                     ("No usable TLS certificate found and creating one failed!\n"),
                     "transport-https");
    GNUNET_free (key_file);
    GNUNET_free (cert_file);

    GNUNET_free_non_null (plugin->key);
    GNUNET_free_non_null (plugin->cert);
    GNUNET_free_non_null (plugin->crypto_init);

    return GNUNET_SYSERR;
  }
  GNUNET_free (key_file);
  GNUNET_free (cert_file);
#if DEBUG_HTTP
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "TLS certificate loaded\n");
#endif

  return res;
}
#endif


/**
 * Process GET or PUT request received via MHD.  For
 * GET, queue response that will send back our pending
 * messages.  For PUT, process incoming data and send
 * to GNUnet core.  In either case, check if a session
 * already exists and create a new one if not.
 */
static int
server_access_cb (void *cls, struct MHD_Connection *mhd_connection,
                  const char *url, const char *method, const char *version,
                  const char *upload_data, size_t * upload_data_size,
                  void **httpSessionCache)
{
  struct Plugin *plugin = cls;
  struct ServerConnection *sc = *httpSessionCache;
  struct Session *s = NULL;

  int res = MHD_YES;
  struct MHD_Response *response;

  GNUNET_assert (cls != NULL);
  /* new connection */
  if (sc == NULL)
    {
    uint32_t tag;
    const union MHD_ConnectionInfo *conn_info;
    size_t addrlen;
    struct GNUNET_PeerIdentity target;
    int check = GNUNET_NO;
    struct Session * t;
    int direction;

    conn_info = MHD_get_connection_info (mhd_connection, MHD_CONNECTION_INFO_CLIENT_ADDRESS);
    if (conn_info->client_addr->sa_family == AF_INET)
      addrlen = sizeof (struct sockaddr_in);
    else if (conn_info->client_addr->sa_family == AF_INET6)
      addrlen = sizeof (struct sockaddr_in6);
    else
      return MHD_NO;

    if ((strlen(&url[1]) >= 105)  && (url[104] == ';'))
    {
      char hash[104];
      char * tagc = (char *) &url[105];
      memcpy(&hash, &url[1], 103);
      hash [103] = '\0';
      if (GNUNET_OK == GNUNET_CRYPTO_hash_from_string ((const char *) &hash, &(target.hashPubKey)))
      {
        tag = strtoul (tagc, NULL, 10);
        if (tagc > 0)
          check = GNUNET_YES;
      }
    }

    if (0 == strcmp (MHD_HTTP_METHOD_PUT, method))
      direction = _RECEIVE;
    if (0 == strcmp (MHD_HTTP_METHOD_GET, method))
      direction = _SEND;

    if (check == GNUNET_NO)
      goto error;

    plugin->cur_connections++;

#if VERBOSE_SERVER
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "server: New inbound connection from %s with tag %u\n", GNUNET_h2s_full(&(target.hashPubKey)), tag);
#endif
    /* find duplicate session */

    t = plugin->head;

    while (t != NULL)
    {
      if ((t->inbound) && (0 == memcmp (&t->target, &target, sizeof (struct GNUNET_PeerIdentity))) &&
          /* FIXME add source address comparison */
          (t->tag == tag))
      break;
      t = t->next;
    }
    if (t != NULL)
    {
#if VERBOSE_SERVER
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "server: Duplicate session, dismissing new connection from peer `%s'\n", GNUNET_i2s (&target));
#endif
      goto error;
    }

    /* find semi-session */
    t = plugin->server_semi_head;

    while (t != NULL)
    {
      /* FIXME add source address comparison */
      if ((0 == memcmp (&t->target, &target, sizeof (struct GNUNET_PeerIdentity))) &&
          (t->tag == tag))
      {
        break;
      }
      t = t->next;
    }

    if (t == NULL)
      goto create;

#if VERBOSE_SERVER
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "server: Found existing semi-session for `%s'\n", GNUNET_i2s (&target));
#endif

    if ((direction == _SEND) && (t->server_send != NULL))
    {
#if VERBOSE_SERVER
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "server: Duplicate GET session, dismissing new connection from peer `%s'\n", GNUNET_i2s (&target));
#endif
      goto error;
    }
    else
    {
      s = t;
      GNUNET_CONTAINER_DLL_remove(plugin->server_semi_head, plugin->server_semi_tail, s);
      GNUNET_CONTAINER_DLL_insert(plugin->head, plugin->tail, s);
#if VERBOSE_SERVER
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "server: Found matching semi-session, merging session for peer `%s'\n", GNUNET_i2s (&target));
#endif

      goto found;
    }
    if ((direction == _RECEIVE) && (t->server_recv != NULL))
    {
#if VERBOSE_SERVER
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "server: Duplicate PUT session, dismissing new connection from peer `%s'\n", GNUNET_i2s (&target));
#endif
      goto error;
    }
    else
    {
      s = t;
      GNUNET_CONTAINER_DLL_remove(plugin->server_semi_head, plugin->server_semi_tail, s);
      GNUNET_CONTAINER_DLL_insert(plugin->head, plugin->tail, s);
#if VERBOSE_SERVER
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "server: Found matching semi-session, merging session for peer `%s'\n", GNUNET_i2s (&target));
#endif
      goto found;
    }

create:
/* create new session */
#if VERBOSE_SERVER
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "server: Creating new session for peer `%s' \n", GNUNET_i2s (&target));
#endif

    s = create_session(plugin,
                        &target,
                        conn_info->client_addr,
                        addrlen,
                        NULL,
                        NULL);

    s->inbound = GNUNET_YES;
    s->tag= tag;
    if (0 == strcmp (MHD_HTTP_METHOD_PUT, method))
      s->server_recv = s;
    if (0 == strcmp (MHD_HTTP_METHOD_GET, method))
      s->server_send = s;
    GNUNET_CONTAINER_DLL_insert (plugin->server_semi_head, plugin->server_semi_tail, s);

    goto found;
error:
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "server: Invalid connection request\n");
        response = MHD_create_response_from_data (strlen (HTTP_ERROR_RESPONSE),HTTP_ERROR_RESPONSE, MHD_NO, MHD_NO);
        res = MHD_queue_response (mhd_connection, MHD_HTTP_NOT_FOUND, response);
        MHD_destroy_response (response);
        return res;


found:


    sc = GNUNET_malloc (sizeof (struct ServerConnection));
    sc->mhd_conn = mhd_connection;
    sc->direction = direction;
    sc->session = s;
    if (direction == _SEND)
      s->server_send = sc;
    if (direction == _RECEIVE)
      s->server_recv = sc;

    (*httpSessionCache) = sc;
    return MHD_YES;
  }
  /* existing connection */
  sc = (*httpSessionCache);
  s = sc->session;

  /* connection is to be disconnected*/
  if (sc->disconnect == GNUNET_YES)
  {
    response = MHD_create_response_from_data (strlen ("Thank you!"), "Thank you!", MHD_NO, MHD_NO);
    res = MHD_queue_response (mhd_connection, MHD_HTTP_OK, response);
#if VERBOSE_SERVER
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Sent HTTP/1.1: 200 OK as PUT Response\n");
#endif
    MHD_destroy_response (response);
    return MHD_YES;
  }

  return res;
}

static void
server_disconnect_cb (void *cls, struct MHD_Connection *connection,
                      void **httpSessionCache)
{
  struct ServerConnection *sc = *httpSessionCache;
  struct ServerConnection *tc = *httpSessionCache;
  struct Session * s = NULL;
  struct Session * t = NULL;
  struct Plugin * plugin = NULL;

  if (sc == NULL)
    return;

  s = sc->session;
  plugin = s-> plugin;
  if (sc->direction == _SEND)
  {
#if VERBOSE_SERVER
  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                   "Server: peer `%s' PUT on address `%s' disconnected\n",
                   GNUNET_i2s (&s->target), GNUNET_a2s (s->addr, s->addrlen));
#endif
    s->server_send = NULL;
    /* FIXME miminimize timeout here */
    if (s->server_recv != NULL)
    {
      tc = s->server_recv;
      tc->disconnect = GNUNET_YES;
    }
  }
  if (sc->direction == _RECEIVE)
  {
#if VERBOSE_SERVER
  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                   "Server: peer `%s' GET on address `%s' disconnected\n",
                   GNUNET_i2s (&s->target), GNUNET_a2s (s->addr, s->addrlen));
#endif
    s->server_recv = NULL;
    //MHD_
    if (s->server_send != NULL)
    {
      tc = s->server_send;
      tc->disconnect = GNUNET_YES;
    }
  }
  GNUNET_free (sc);

  t = plugin->server_semi_head;
  while (t != NULL)
  {
    if (t == s)
    {
      GNUNET_CONTAINER_DLL_remove(plugin->server_semi_head, plugin->server_semi_tail, s);
      GNUNET_CONTAINER_DLL_insert(plugin->head, plugin->tail, s);
      break;
    }
    t = t->next;
  }
  plugin->cur_connections--;

  if ((s->server_send == NULL) && (s->server_recv == NULL))
  {
#if VERBOSE_SERVER
  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                   "Server: peer `%s' on address `%s' disconnected\n",
                   GNUNET_i2s (&s->target), GNUNET_a2s (s->addr, s->addrlen));
#endif
    notify_session_end(s->plugin, &s->target, s);
  }
}

int
server_disconnect (struct Session *s)
{
  struct Plugin *plugin = s->plugin;
  struct Session *t = plugin->head;

  while (t != NULL)
  {
    if (t->inbound == GNUNET_YES)
    {
      if (t->server_send != NULL)
      {
        ((struct ServerConnection *) t->server_send)->disconnect = GNUNET_YES;
      }
      if (t->server_send != NULL)
      {
        ((struct ServerConnection *) t->server_send)->disconnect = GNUNET_YES;
      }
    }
    t = t->next;
  }


  return GNUNET_OK;
}

int
server_send (struct Session *s, const char *msgbuf, size_t msgbuf_size)
{
  return GNUNET_OK;
}

/**
 * Function that queries MHD's select sets and
 * starts the task waiting for them.
 * @param plugin plugin
 * @param daemon_handle the MHD daemon handle
 * @return gnunet task identifier
 */
static GNUNET_SCHEDULER_TaskIdentifier
server_schedule (struct Plugin *plugin, struct MHD_Daemon *daemon_handle);

/**
 * Call MHD IPv4 to process pending requests and then go back
 * and schedule the next run.
 * @param cls plugin as closure
 * @param tc task context
 */
static void
server_v4_run (void *cls,
                           const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct Plugin *plugin = cls;
  GNUNET_assert (cls != NULL);

  plugin->server_v4_task = GNUNET_SCHEDULER_NO_TASK;

  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
    return;

  GNUNET_assert (MHD_YES == MHD_run (plugin->server_v4));
  plugin->server_v4_task = server_schedule (plugin, plugin->server_v4);
}


/**
 * Call MHD IPv6 to process pending requests and then go back
 * and schedule the next run.
 * @param cls plugin as closure
 * @param tc task context
 */
static void
server_v6_run (void *cls,
                           const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct Plugin *plugin = cls;
  GNUNET_assert (cls != NULL);

  plugin->server_v6_task = GNUNET_SCHEDULER_NO_TASK;

  if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
    return;

  GNUNET_assert (MHD_YES == MHD_run (plugin->server_v6));
  plugin->server_v6_task = server_schedule (plugin, plugin->server_v6);
}

/**
 * Function that queries MHD's select sets and
 * starts the task waiting for them.
 * @param plugin plugin
 * @param daemon_handle the MHD daemon handle
 * @return gnunet task identifier
 */
static GNUNET_SCHEDULER_TaskIdentifier
server_schedule (struct Plugin *plugin, struct MHD_Daemon *daemon_handle)
{
  GNUNET_SCHEDULER_TaskIdentifier ret;
  fd_set rs;
  fd_set ws;
  fd_set es;
  struct GNUNET_NETWORK_FDSet *wrs;
  struct GNUNET_NETWORK_FDSet *wws;
  struct GNUNET_NETWORK_FDSet *wes;
  int max;
  unsigned long long timeout;
  int haveto;
  struct GNUNET_TIME_Relative tv;

  ret = GNUNET_SCHEDULER_NO_TASK;
  FD_ZERO (&rs);
  FD_ZERO (&ws);
  FD_ZERO (&es);
  wrs = GNUNET_NETWORK_fdset_create ();
  wes = GNUNET_NETWORK_fdset_create ();
  wws = GNUNET_NETWORK_fdset_create ();
  max = -1;
  GNUNET_assert (MHD_YES == MHD_get_fdset (daemon_handle, &rs, &ws, &es, &max));
  haveto = MHD_get_timeout (daemon_handle, &timeout);
  if (haveto == MHD_YES)
    tv.rel_value = (uint64_t) timeout;
  else
    tv = GNUNET_TIME_UNIT_SECONDS;
  GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
  GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
  GNUNET_NETWORK_fdset_copy_native (wes, &es, max + 1);
  if (daemon_handle == plugin->server_v4)
  {
    if (plugin->server_v4_task != GNUNET_SCHEDULER_NO_TASK)
    {
      GNUNET_SCHEDULER_cancel (plugin->server_v4_task);
      plugin->server_v4_task = GNUNET_SCHEDULER_NO_TASK;
    }

    ret =
        GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
                                     GNUNET_SCHEDULER_NO_TASK, tv, wrs, wws,
                                     &server_v4_run, plugin);
  }
  if (daemon_handle == plugin->server_v6)
  {
    if (plugin->server_v6_task != GNUNET_SCHEDULER_NO_TASK)
    {
      GNUNET_SCHEDULER_cancel (plugin->server_v6_task);
      plugin->server_v6_task = GNUNET_SCHEDULER_NO_TASK;
    }

    ret =
        GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
                                     GNUNET_SCHEDULER_NO_TASK, tv, wrs, wws,
                                     &server_v6_run, plugin);
  }
  GNUNET_NETWORK_fdset_destroy (wrs);
  GNUNET_NETWORK_fdset_destroy (wws);
  GNUNET_NETWORK_fdset_destroy (wes);
  return ret;
}

int
server_start (struct Plugin *plugin)
{
  int res = GNUNET_OK;

#if BUILD_HTTPS
  res = server_load_certificate (plugin);
  if (res == GNUNET_SYSERR)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "TABORT\n");
    return res;
  }
#endif

  plugin->server_v4 = NULL;
  if (plugin->ipv4 == GNUNET_YES)
  {
    plugin->server_v4 = MHD_start_daemon (
#if VERBOSE_SERVER
                                           MHD_USE_DEBUG |
#endif
#if BUILD_HTTPS
                                           MHD_USE_SSL |
#endif
                                           MHD_NO_FLAG, plugin->port,
                                           &server_accept_cb, plugin,
                                           &server_access_cb, plugin,
                                           //MHD_OPTION_SOCK_ADDR,
                                           //(struct sockaddr_in *)
                                           //plugin->bind4_address,
                                           MHD_OPTION_CONNECTION_LIMIT,
                                           (unsigned int)
                                           plugin->max_connections,
#if BUILD_HTTPS
                                           MHD_OPTION_HTTPS_PRIORITIES,
                                           plugin->crypto_init,
                                           MHD_OPTION_HTTPS_MEM_KEY,
                                           plugin->key,
                                           MHD_OPTION_HTTPS_MEM_CERT,
                                           plugin->cert,
#endif
                                           MHD_OPTION_CONNECTION_TIMEOUT,
                                           (unsigned int) 3,
                                           MHD_OPTION_CONNECTION_MEMORY_LIMIT,
                                           (size_t) (2 *
                                                     GNUNET_SERVER_MAX_MESSAGE_SIZE),
                                           MHD_OPTION_NOTIFY_COMPLETED,
                                           &server_disconnect_cb, plugin,
                                           MHD_OPTION_EXTERNAL_LOGGER,
                                           server_log, NULL, MHD_OPTION_END);
    if (plugin->server_v4 == NULL)
      res = GNUNET_SYSERR;
  }
  plugin->server_v6 = NULL;
  if (plugin->ipv6 == GNUNET_YES)
  {
    plugin->server_v6 = MHD_start_daemon (
#if VERBOSE_SERVER
                                           MHD_USE_DEBUG |
#endif
#if BUILD_HTTPS
                                           MHD_USE_SSL |
#endif
                                           MHD_USE_IPv6, plugin->port,
                                           &server_accept_cb, plugin,
                                           &server_access_cb, plugin,
                                           //MHD_OPTION_SOCK_ADDR,
                                           //tmp,
                                           MHD_OPTION_CONNECTION_LIMIT,
                                           (unsigned int)
                                           plugin->max_connections,
#if BUILD_HTTPS
                                           MHD_OPTION_HTTPS_PRIORITIES,
                                           plugin->crypto_init,
                                           MHD_OPTION_HTTPS_MEM_KEY,
                                           plugin->key,
                                           MHD_OPTION_HTTPS_MEM_CERT,
                                           plugin->cert,
#endif
                                           MHD_OPTION_CONNECTION_TIMEOUT,
                                           (unsigned int) 3,
                                           MHD_OPTION_CONNECTION_MEMORY_LIMIT,
                                           (size_t) (2 *
                                                     GNUNET_SERVER_MAX_MESSAGE_SIZE),
                                           MHD_OPTION_NOTIFY_COMPLETED,
                                           &server_disconnect_cb, plugin,
                                           MHD_OPTION_EXTERNAL_LOGGER,
                                           server_log, NULL, MHD_OPTION_END);

    if (plugin->server_v6 == NULL)
      res = GNUNET_SYSERR;
  }

  if (plugin->server_v4 != NULL)
    plugin->server_v4_task = server_schedule (plugin, plugin->server_v4);
  if (plugin->server_v6 != NULL)
    plugin->server_v6_task = server_schedule (plugin, plugin->server_v6);

#if DEBUG_HTTP
  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                   "%s server component started on port %u\n", plugin->name,
                   plugin->port);
#endif
  return res;
}

void
server_stop (struct Plugin *plugin)
{
  struct Session *s = NULL;
  struct Session *t = NULL;

  if (plugin->server_v4_task != GNUNET_SCHEDULER_NO_TASK)
  {
    GNUNET_SCHEDULER_cancel (plugin->server_v4_task);
    plugin->server_v4_task = GNUNET_SCHEDULER_NO_TASK;
  }

  if (plugin->server_v6_task != GNUNET_SCHEDULER_NO_TASK)
  {
    GNUNET_SCHEDULER_cancel (plugin->server_v6_task);
    plugin->server_v6_task = GNUNET_SCHEDULER_NO_TASK;
  }

  if (plugin->server_v4 != NULL)
  {
    MHD_stop_daemon (plugin->server_v4);
    plugin->server_v4 = NULL;
  }
  if (plugin->server_v6 != NULL)
  {
    MHD_stop_daemon (plugin->server_v6);
    plugin->server_v6 = NULL;
  }

  /* cleaning up semi-sessions never propagated */
  s = plugin->server_semi_head;
  while (s != NULL)
  {
    t = s->next;
    delete_session (s);
    s = t;
  }

#if BUILD_HTTPS
  GNUNET_free_non_null (plugin->crypto_init);
  GNUNET_free_non_null (plugin->cert);
  GNUNET_free_non_null (plugin->key);
#endif

#if DEBUG_HTTP
  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
                   "%s server component stopped\n", plugin->name);
#endif
}



/* end of plugin_transport_http.c */